The first protester burst in to the lecture hall and pointed at the speakers

The building was evacuated and the police called after fights broke out between the protesters and audience members.

A number of notes were left by protesters with one reading: "The guy moderating the talk is on my course and he'll have a difficult time once the strike is over."

The talk had been originally scheduled for March 4, but was apparently rescheduled due to security fears.

An eye-witness, who did not wish to be named, told the Daily Mail: "Ten to 15 people dressed all in black, with black hoods and black face masks, leapt over the barriers and instantly engaged in a fight with two or three security guards,

"They tried to stop them but they just started punching them in the face. One guard received several punches."

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A note left by one of the masked group addressing one of the moderators

Alex Buhaenko

Controversial speaker Carl Benjamin watches on after the group stormed the event

The group were waving an Antifa flag and the North London Antifa group later tweeted: "Tonight a group of student and anti-fascist activists successfully shut down an 'alt-right' talk at Kings College.

"Here's alt-right mouthpiece 'Sargon of Akkad' after he was forced to leave the building, no platform for him tonight."

The group was founded in the US and is known for carrying out protests, often in a militant fashion.

A spokesman for the KCL Libertarian Society said in a statement: "Windows have been smashed and gas bombs lit outside campus.

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